Question

six different aqueous solutions are represented in the beakers below, and there total volumes are noted. (a) which solution has the highest molarity? (b) which solutions have the same molarity? (c) if you mix solutions A and C, does the resulting solution have a higher molarity then, a lower then, or the same molarity as solution B? (d) after 50.mL of water is added to solution D, is its molarity high than, lower than or the same as the molarity of solution F after 75mL is added to it? (e) how much solvent must be evaporated from the solution of E for it to have the same molarity as solution A?

Answer 1

The molarity of the solutions are as follows:

• solution B has the highest molarity
• solutions A, D and F have the same molarity
• solutions A and C are mixed together have a lower molarity than B
• solution F and D will have the same molarity
• Volume of water required to be evaporated is 8.3 mL

What is molarity of a solution?

The molarity of a solution is the amount in moles of a substance present in a given volume of solution.

From the image of the solution given:

• solution B has the highest molarity
• solutions A, D and F have the same molarity
• when solutions A and C are mixed, the resulting solution have a lower molarity than B
• solution F and D will have the same molarity after 75 mL and 50 mL of water are added to each respectively
• the molarity of B is 12/50 = 4/16.7. Volume of water required to be evaporated = 25 - 16.7 = 8.3 mL

Therefore, the molarity of the solutions depends on the moles of substance present per given volume of solution.

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